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#173746 - 01/17/08 06:48 PM GEC installation  
jem  Offline
New Member
Joined: Apr 2007
Posts: 8
nc
I'm replacing a 200 amp residential service. Meter base feeding a 200 amp main-breaker panel that is inside directly behind the meter base. The #4 bare copper GEC from the water pipe will only reach a ground bar in top of the panel which is the service disconnct. I'll be driving a supplemental ground rod. Is it OK to run the #6 bare copper GEC from the ground rod to the grounded conductor in the meter base or must it terminate on the same ground bar as the #4 bare copper GEC.


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#173749 - 01/17/08 07:49 PM Re: GEC installation [Re: jem]  
leland  Offline
Member
Joined: Aug 2007
Posts: 853
Lowell area, Ma. USA
The meter base should be fine (is),If the POCO and AHJ agree.


#173770 - 01/18/08 12:52 AM Re: GEC installation [Re: leland]  
KJay  Offline
Member
Joined: Nov 2007
Posts: 763
MA, USA
I would definitely check with the local AHJ to be sure, as leland stated.
Where I used to live the power co would install locks on the residential meter cans and because of this, the local inspectors considered the GEC connection inaccessible after installation as per 250.68[A]. They required it to be brought either to the panel or the disconnect enclosure in order for them to consider it accessible after installation. When the power co switched to requiring ring-less meter sockets and started using just a Buddco tag instead of locks, those inspectors then began allowing the connection of the GEC in the meter can.
Also, don’t forget, to avoid having to verify to the inspector that you have 25 ohms or less on your supplemental ground rod, you’ll probably just want to install a second rod and be done with it, as allowed in 250.56. I usually install them the length of the rod apart.


#173776 - 01/18/08 02:14 AM Re: GEC installation [Re: KJay]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,123
Estero,Fl,usa
Ask the AHJ how he feels about 250.64(C) ex
Quote
Exception: Sections of busbars shall be permitted to be connected together to form a grounding electrode conductor.


You might be able to run a #4 from the busbar you hit to the one where the neutral lands.


Greg Fretwell

#173834 - 01/20/08 08:01 AM Re: GEC installation [Re: gfretwell]  
Electricmanscott  Offline
Member
Joined: Jan 2002
Posts: 1,457
Holden, MA USA
As far as NEC is concerned you can land that #6 in the meter enclosure in this application. As others stated check poco rules. You also will need two rods per NEC.



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